如何从控制器路线Rails 4进入不同视图

Question

I'm moving a Sinatra app I made a while back to Rails 4. In my Sinatra app I had a helper called "logged_in" that returned true if the a user was logged in and returned false otherwise. Then in my routes I had the following...

get '/' do
  if logged_in
    erb :"admin/a_index"
  else
    erb :index
  end
end

get '/about' do
  if logged_in
    erb :"admin/a_about"
  else
    erb :about
  end
end

get '/contact' do
  if logged_in
    erb :"admin/a_contact"
  else
    erb :contact
  end
end

So that if the user was logged in, it would render a different admin view (located in a sub-folder) for that specific static page. If the user wasn't logged in, it would render a default static page.

How can I implement this in Rails 4?

Do I have to specify extra admin routes or can I do something like the following... ?

class PagesController < ApplicationController

  def home
    if logged_in
      render #admin_home
    else
      render #home
    end
  end

  def about
    if logged_in
      render #admin_about
    else
      render #about
    end
  end

  def contact
    if logged_in
      render #admin_contact
    else
      render #contact
    end
  end
end

with just the following routes...

Rails.application.routes.draw do
  root 'pages#home'
  get '/home' => 'pages#home'
  get '/about' => 'pages#about'
  get '/contact' => 'pages#contact'

  get '/signup' => 'users#new'
  post '/users' => 'users#create'

  get '/login' => 'sessions#new'
  post '/login' => 'sessions#create'
  get '/logout' => 'sessions#destroy'
end

Answer 1

You can totally just do:

if logged_in?
  render  'admin/index'
else
  render 'index'
end

But the convention that I've seen in Rails is to have an admin namespace for controllers and views. If you're using Devise, it looks like you can write signed in routes like so:

authenticated do
  get '/home' => 'admin/pages#home'
end

Which means, of course, that you'd have to specify the same routes for non-signed in users. But then you'd have a separate controller (AdminPagesController in contorllers/admin) and action for admin in case you need to load different data. Views would then go in views/admin/.

Answer 2

Answer is no. Render only renders a specific page, it doesn't call any new routes. That is what redirect_to does: it calls a whole new route. You can call render for any view in your application, just as long as you have the right instance variables to make it display properly.